ObjectFile.cpp revision 001c9205fca2220480589ec355cb6ec701a37e08 
1//===- ObjectFile.cpp - File format independent object file -----*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file defines a file format independent ObjectFile class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/Object/ObjectFile.h"
15#include "llvm/ADT/OwningPtr.h"
16#include "llvm/Support/ErrorHandling.h"
17#include "llvm/Support/MemoryBuffer.h"
18#include "llvm/Support/Path.h"
19#include "llvm/Support/system_error.h"
20
21using namespace llvm;
22using namespace object;
23
24ObjectFile::ObjectFile(unsigned int Type, MemoryBuffer *source, error_code &ec)
25  : Binary(Type, source) {
26}
27
28ObjectFile *ObjectFile::createObjectFile(MemoryBuffer *Object) {
29  if (!Object || Object->getBufferSize() < 64)
30    return 0;
31  sys::LLVMFileType type = sys::IdentifyFileType(Object->getBufferStart(),
32                                static_cast<unsigned>(Object->getBufferSize()));
33  switch (type) {
34    case sys::ELF_Relocatable_FileType:
35    case sys::ELF_Executable_FileType:
36    case sys::ELF_SharedObject_FileType:
37    case sys::ELF_Core_FileType:
38      return createELFObjectFile(Object);
39    case sys::Mach_O_Object_FileType:
40    case sys::Mach_O_Executable_FileType:
41    case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
42    case sys::Mach_O_Core_FileType:
43    case sys::Mach_O_PreloadExecutable_FileType:
44    case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
45    case sys::Mach_O_DynamicLinker_FileType:
46    case sys::Mach_O_Bundle_FileType:
47    case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
48      return createMachOObjectFile(Object);
49    case sys::COFF_FileType:
50      return createCOFFObjectFile(Object);
51    default:
52      llvm_unreachable("Unknown Object File Type");
53  }
54}
55
56ObjectFile *ObjectFile::createObjectFile(StringRef ObjectPath) {
57  OwningPtr<MemoryBuffer> File;
58  if (error_code ec = MemoryBuffer::getFile(ObjectPath, File))
59    return NULL;
60  return createObjectFile(File.take());
61}
62